Synopsis by Hal Erickson
As the Jupiter 2 continues its journey through space, Dr. Smith (Jonathan Harris) picks up a radio message, supposedly from earth. Blindly following the message (the voice on the other end is alluringly feminine!), Smith redirects the spacecraft to a strange, spectral planet controlled by robots. Almost immediately, the Robinsons are enslaved by the metallic aliens--while their own Robot, incapacitated by a ray gun, is unable to come to the rescue.